<template>
    <div class="upload-file">
        <el-upload multiple :action="uploadFileUrl" :before-upload="handleBeforeUpload" :file-list="fileList"
            :limit="limit" :on-error="handleUploadError" :on-exceed="handleExceed" :on-success="handleUploadSuccess"
            :show-file-list="true" :headers="headers" class="upload-file-uploader" ref="fileUpload" v-if="!disabled"
            :data="props.afferentData">
            <!-- 上传按钮 -->
            <!-- <el-button type="primary">选取文件</el-button> -->

            <template #trigger>
                <el-button type="primary">select file</el-button>
            </template>
        </el-upload>

        <!-- <transition-group class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear"
            tag="ul">
            <li :key="file.uid" class="el-upload-list__item ele-upload-list__item-content"
                v-for="(file, index) in fileList">
                <el-link :href="`${baseUrl}${file.url}`" :underline="false" target="_blank">
                    <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
                </el-link>
                <div class="ele-upload-list__item-content-action">
                    <el-link :underline="false" @click="handleDelete(index)" type="danger" v-if="!disabled">删除</el-link>
                </div>
            </li> 
        </transition-group> -->

    </div>
</template>

<script setup>
import { getToken } from "@/utils/auth";
import { genFileId } from "element-plus";
import { compareTime } from "element-plus/es/components/time-select/src/utils.mjs";

const props = defineProps({
    modelValue: [String, Object, Array],
    // 数量限制
    limit: {
        type: Number,
        default: 5
    },
    // 大小限制(MB)
    fileSize: {
        type: Number,
        default: 5
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
        type: Array,
        default: () => ["doc", "docx", "xls", "xlsx", "ppt", "pptx", "txt", "pdf", "CATPart"]
    },
    // 是否显示提示
    isShowTip: {
        type: Boolean,
        default: true
    },
    // 禁用组件（仅查看文件）
    disabled: {
        type: Boolean,
        default: false
    },
    uploadUrl: {
        type: String,
        default: "/common/upload"
    },
    afferentData: {
        type: Object,
        default: () => ({})
    },
});

const { proxy } = getCurrentInstance();
const emit = defineEmits();
const number = ref(0);
const uploadList = ref([]);
const baseUrl = import.meta.env.VITE_APP_BASE_API;
const uploadFileUrl = ref(import.meta.env.VITE_APP_BASE_API + props.uploadUrl); // 上传文件服务器地址
const headers = ref({ Authorization: "Bearer " + getToken() });
const fileList = ref([]);
const fileUpload = ref();
const showTip = computed(
    () => props.isShowTip && (props.fileType || props.fileSize)
);

watch(() => props.modelValue, val => {
    if (val) {
        let temp = 1;
        // 首先将值转为数组
        const list = Array.isArray(val) ? val : props.modelValue.split(',');
        // 然后将数组转为对象数组
        fileList.value = list.map(item => {
            if (typeof item === "string") {
                item = { name: item, url: item };
            }
            item.uid = item.uid || new Date().getTime() + temp++;
            return item;
        });
    } else {
        fileList.value = [];
        return [];
    }
}, { deep: true, immediate: true });

// 上传前校检格式和大小
function handleBeforeUpload(file) {
    // 校检文件类型
    /* if (props.fileType.length) {
      const fileName = file.name.split('.');
      const fileExt = fileName[fileName.length - 1];
      const isTypeOk = props.fileType.indexOf(fileExt) >= 0;
      if (!isTypeOk) {
        proxy.$modal.msgError(`文件格式不正确，请上传${props.fileType.join("/")}格式文件!`);
        return false;
      }
    } */
    // 校检文件名是否包含特殊字符
    if (file.name.includes(',')) {
        proxy.$modal.msgError('文件名不正确，不能包含英文逗号!');
        return false;
    }
    // 校检文件大小
    /* if (props.fileSize) {
      const isLt = file.size / 1024 / 1024 < props.fileSize;
      if (!isLt) {
        proxy.$modal.msgError(`上传文件大小不能超过 ${props.fileSize} MB!`);
        return false;
      }
    } */
    proxy.$modal.loading("正在上传文件，请稍候...");
    number.value++;
    return true;
}

// 文件个数超出
function handleExceed(files) {
    fileUpload.value.clearFiles();
    const file = files[0];
    file.uid = genFileId();

    fileUpload.value.handleStart(file);
    // proxy.$modal.msgError(`上传文件数量不能超过 ${props.limit} 个!`);
}

// 上传失败
function handleUploadError(err) {
    proxy.$modal.msgError("上传文件失败");
}

// 上传成功回调
function handleUploadSuccess(res, file) {
    if (res.code === 200) {
        uploadList.value.push({ name: res.fileName, url: res.url });
        console.log(uploadList.value);
        
        uploadedSuccessfully();
    } else {
        number.value--;
        proxy.$modal.closeLoading();
        proxy.$modal.msgError(res.msg);
        proxy.$refs.fileUpload.handleRemove(file);
        uploadedSuccessfully();
    }
}

// 删除文件
function handleDelete(index) {
    fileList.value.splice(index, 1);
    emit("update:modelValue", listToString(fileList.value) );
}

// 上传结束处理
function uploadedSuccessfully() {
    if (number.value > 0 && uploadList.value.length === number.value) {
        fileList.value = fileList.value.filter(f => f.url !== undefined).concat(uploadList.value);
        uploadList.value = [];
        number.value = 0;
        emit("update:modelValue", listToString(fileList.value));
        proxy.$modal.closeLoading();
    }
}

// 获取文件名称
function getFileName(name) {
    // 如果是url那么取最后的名字 如果不是直接返回
    if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1);
    } else {
        return name;
    }
}

// 对象转成指定字符串分隔
function listToString(list, separator) {
    let strs = "";
    separator = separator || ",";
    for (let i in list) {
        if (list[i].url) {
            strs += list[i].url + separator;
        }
    }
    return strs != '' ? strs.substr(0, strs.length - 1) : '';
}
</script>

<style scoped lang="scss">
.upload-file-uploader {
    margin-bottom: 5px;
}

.upload-file-list .el-upload-list__item {
    border: 1px solid #e4e7ed;
    line-height: 2;
    margin-bottom: 10px;
    position: relative;
}

.upload-file-list .ele-upload-list__item-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: inherit;
}

.ele-upload-list__item-content-action .el-link {
    margin-right: 10px;
}
</style>
